fix: 更新图标和按钮样式以提升用户界面一致性

- 在 MainFormUi.cs 中，将“加载迭代列表”按钮的图标更改为 Fetch，更新“补挂父项”按钮的图标为 Tree，以增强视觉一致性。
- 在 Theme.cs 中，新增 Fetch 和 Tree 图标类型，并优化现有图标的绘制逻辑，确保在不同尺寸下的清晰度。
- debug.log 文件中添加了新的错误记录，便于后续调试和问题追踪。

TfsExcelImporter/MainFormUi.cs

@@ -276,7 +276,7 @@ namespace TfsExcelImporter
             _fExcel = NewField(_txtExcel, 500, true);
             _fParent = NewField(_txtParentPbi, 150, true);
 
-            _btnLoadIterations = NewButton("加载迭代列表", BtnKind.Secondary, IconKind.Sync, 130);
+            _btnLoadIterations = NewButton("加载迭代列表", BtnKind.Secondary, IconKind.Fetch, 130);
             _btnBrowse = NewButton("浏览…", BtnKind.Secondary, IconKind.Folder, 92);
             _btnTemplate = NewButton("导出 Excel 模板", BtnKind.Secondary, IconKind.Doc, 142);
             _chkSkip = NewCheck("跳过已存在标题", "");
@@ -454,7 +454,7 @@ namespace TfsExcelImporter
             _cardAdv.ShowBadge = false;
             _fArea = NewField(_txtAreaPath, 420, true);
             _btnFixArea = NewButton("按迭代修 Area", BtnKind.Secondary, IconKind.Wrench, 158);
-            _btnLinkParent = NewButton("补挂父项", BtnKind.Secondary, IconKind.ArrowUp, 120);
+            _btnLinkParent = NewButton("补挂父项", BtnKind.Secondary, IconKind.Tree, 120);
 
             int y = _cardAdv.HeaderH + Theme.S12;
             y = Row(_cardAdv, y, 52, "Area 路径", _fArea, "改 Area 与补挂父项都按上面的「目标迭代」筛选已有工作项");

TfsExcelImporter/Theme.cs

@@ -199,10 +199,14 @@ namespace TfsExcelImporter
 
     internal enum IconKind
     {
-        None, ChevronDown, ChevronRight, Check, Bolt, Folder, Doc, ArrowUp, Wrench, Trash, Table, Gear, Sync
+        None, ChevronDown, ChevronRight, Check, Bolt, Folder, Doc, ArrowUp, Wrench, Trash, Table, Gear, Fetch, Tree
     }
 
-    /// <summary>GDI+ 矢量图标：统一 24 网格、约 1.6 描边、圆头。界面内不用 emoji、不用位图。</summary>
+    /// <summary>
+    /// GDI+ 矢量图标：统一 24 网格、约 2 描边、圆头圆角。界面内不用 emoji、不用位图。
+    /// 这条流水线的图标实际只有 14~16px，所以几何一律「少笔画、留大间隙」：
+    /// 细节（桶身竖纹、齿轮齿）在小尺寸会糊成一坨，宁可省略也不用 2 个网格以内的短笔画。
+    /// </summary>
     internal static class Icons
     {
         public static void Draw(Graphics g, IconKind kind, Rectangle box, Color color)
@@ -215,7 +219,10 @@ namespace TfsExcelImporter
             float ox = box.X + (box.Width - side) / 2f;
             float oy = box.Y + (box.Height - side) / 2f;
 
-            using (var pen = new Pen(color, Math.Max(1.2f, 1.7f * k)))
+            // 描边随尺寸线性走（24 网格 2px），最小 1.35 保证 14px 下不断线
+            float stroke = Math.Max(1.35f, 2f * k);
+            using (var pen = new Pen(color, stroke))
+            using (var brush = new SolidBrush(color))
             {
                 pen.StartCap = LineCap.Round;
                 pen.EndCap = LineCap.Round;
@@ -223,69 +230,127 @@ namespace TfsExcelImporter
                 switch (kind)
                 {
                     case IconKind.ChevronDown:
-                        Poly(g, pen, ox, oy, k, 6, 9, 12, 15, 18, 9);
+                        Poly(g, pen, ox, oy, k, 6.2f, 9.2f, 12f, 15f, 17.8f, 9.2f);
                         break;
                     case IconKind.ChevronRight:
-                        Poly(g, pen, ox, oy, k, 9, 6, 15, 12, 9, 18);
+                        Poly(g, pen, ox, oy, k, 9.2f, 6.2f, 15f, 12f, 9.2f, 17.8f);
                         break;
                     case IconKind.Check:
-                        Poly(g, pen, ox, oy, k, 5, 13, 10, 18, 19, 6);
+                        Poly(g, pen, ox, oy, k, 4.8f, 12.6f, 9.6f, 17.4f, 19.2f, 6.6f);
                         break;
-                    case IconKind.Bolt:
+                    case IconKind.Bolt: // 实心：14px 下描边闪电会糊成一根棍
-                        Poly(g, pen, ox, oy, k, 13, 3, 6, 13, 12, 13, 11, 21, 18, 11, 12, 11, 13, 3);
+                        Fill(g, brush, ox, oy, k, 13.2f, 2.4f, 4.8f, 13.4f, 10.4f, 13.4f,
+                            10.8f, 21.6f, 19.2f, 10.6f, 13.6f, 10.6f);
                         break;
                     case IconKind.Folder:
-                        Poly(g, pen, ox, oy, k, 3, 7, 9, 7, 11, 9, 21, 9, 21, 19, 3, 19, 3, 7);
+                        Poly(g, pen, ox, oy, k, 2.8f, 6.4f, 9.4f, 6.4f, 11.4f, 8.6f,
+                            21.2f, 8.6f, 21.2f, 18.8f, 2.8f, 18.8f, 2.8f, 6.4f);
                         break;
                     case IconKind.Doc:
-                        Poly(g, pen, ox, oy, k, 6, 3, 15, 3, 19, 7, 19, 21, 6, 21, 6, 3);
+                        Poly(g, pen, ox, oy, k, 5.8f, 3f, 14.6f, 3f, 19f, 7.4f, 19f, 21f, 5.8f, 21f, 5.8f, 3f);
-                        Poly(g, pen, ox, oy, k, 15, 3, 15, 7, 19, 7);
+                        Poly(g, pen, ox, oy, k, 14.6f, 3f, 14.6f, 7.4f, 19f, 7.4f);
-                        Line(g, pen, ox, oy, k, 9, 12, 16, 12);
+                        Line(g, pen, ox, oy, k, 8.8f, 12.2f, 16f, 12.2f);
-                        Line(g, pen, ox, oy, k, 9, 16, 16, 16);
+                        Line(g, pen, ox, oy, k, 8.8f, 16.2f, 16f, 16.2f);
                         break;
                     case IconKind.ArrowUp:
-                        Line(g, pen, ox, oy, k, 12, 20, 12, 5);
+                        Line(g, pen, ox, oy, k, 12f, 20.4f, 12f, 5.2f);
-                        Poly(g, pen, ox, oy, k, 5, 12, 12, 5, 19, 12);
+                        Poly(g, pen, ox, oy, k, 5.8f, 11.4f, 12f, 5.2f, 18.2f, 11.4f);
                         break;
-                    case IconKind.Wrench:
+                    case IconKind.Wrench: // 实心开口扳手：环+手柄在 16px 下会读成放大镜，实心剪影才立得住
-                        g.DrawArc(pen, ox + 3 * k, oy + 3 * k, 8 * k, 8 * k, 300f, 250f);
+                        var wst = g.Save();
-                        Line(g, pen, ox, oy, k, 10, 14, 19, 21);
+                        g.TranslateTransform(ox + 12f * k, oy + 12f * k);
+                        g.RotateTransform(45f);
+                        using (var path = new GraphicsPath())
+                        {
+                            path.AddPolygon(new[]
+                            {
+                                new PointF(-4.8f * k, -9.4f * k), new PointF(-1.7f * k, -9.4f * k),
+                                new PointF(-1.7f * k, -6.2f * k), new PointF(1.7f * k, -6.2f * k),
+                                new PointF(1.7f * k, -9.4f * k), new PointF(4.8f * k, -9.4f * k),
+                                new PointF(4.8f * k, -4.4f * k), new PointF(2.2f * k, -1.6f * k),
+                                new PointF(2.2f * k, 9.6f * k), new PointF(-2.2f * k, 9.6f * k),
+                                new PointF(-2.2f * k, -1.6f * k), new PointF(-4.8f * k, -4.4f * k)
+                            });
+                            g.FillPath(brush, path);
+                        }
+                        g.Restore(wst);
                         break;
                     case IconKind.Trash:
-                        Poly(g, pen, ox, oy, k, 4, 7, 20, 7);
+                        Line(g, pen, ox, oy, k, 4.2f, 8.2f, 19.8f, 8.2f);            // 盖
-                        Poly(g, pen, ox, oy, k, 8, 7, 8, 20, 16, 20, 16, 7);
+                        Line(g, pen, ox, oy, k, 9.4f, 4.2f, 14.6f, 4.2f);            // 提手（与盖留 4 单位空隙）
-                        Line(g, pen, ox, oy, k, 11, 4, 13, 4);
+                        Poly(g, pen, ox, oy, k, 6.8f, 8.2f, 6.8f, 20f, 17.2f, 20f, 17.2f, 8.2f); // 桶身
                         break;
                     case IconKind.Table:
-                        g.DrawRectangle(pen, ox + 3 * k, oy + 5 * k, 18 * k, 14 * k);
+                        var tr = new RectangleF(ox + 2.8f * k, oy + 4.6f * k, 18.4f * k, 14.8f * k);
-                        Line(g, pen, ox, oy, k, 3, 10, 21, 10);
+                        using (var path = Theme.RoundRect(tr, 2.2f * k)) g.DrawPath(pen, path);
-                        Line(g, pen, ox, oy, k, 10, 10, 10, 19);
+                        Line(g, pen, ox, oy, k, 2.8f, 9.6f, 21.2f, 9.6f);
+                        Line(g, pen, ox, oy, k, 10.4f, 9.6f, 10.4f, 19.4f);
                         break;
-                    case IconKind.Gear:
+                    case IconKind.Gear: // 环 + 8 根短齿 + 实心轴：齿短一点才不会糊成太阳
-                        g.DrawEllipse(pen, ox + 8 * k, oy + 8 * k, 8 * k, 8 * k);
+                        for (int i = 0; i < 8; i++)
-                        g.DrawEllipse(pen, ox + 10.5f * k, oy + 10.5f * k, 3 * k, 3 * k);
+                        {
+                            double a = i * Math.PI / 4;
+                            Line(g, pen, ox, oy, k, 12f + (float)Math.Cos(a) * 5.2f, 12f + (float)Math.Sin(a) * 5.2f,
+                                12f + (float)Math.Cos(a) * 7.4f, 12f + (float)Math.Sin(a) * 7.4f);
+                        }
+                        g.DrawEllipse(pen, ox + 6.8f * k, oy + 6.8f * k, 10.4f * k, 10.4f * k);
+                        g.FillEllipse(brush, ox + 10.2f * k, oy + 10.2f * k, 3.6f * k, 3.6f * k);
                         break;
-                    case IconKind.Sync: // 拉取服务器数据：带缺口的圆 + 箭头
+                    case IconKind.Fetch: // 从服务器拉取（加载迭代列表）：下箭头落进托盘，与「开始导入」的上箭头成对
-                        g.DrawArc(pen, ox + 4 * k, oy + 4 * k, 16 * k, 16 * k, 300f, 250f);
+                        // 圆形箭头在 16px 下始终读成「缺口的圈 + 一坨」，这里换直线几何；
-                        Poly(g, pen, ox, oy, k, 19, 4, 20, 9, 15, 8);
+                        // 托盘底边取 19.8 而不是 20.2，100%/125% 下都落在像素中心，不会渲成一条虚灰线
+                        Line(g, pen, ox, oy, k, 12f, 3.4f, 12f, 12.2f);
+                        Poly(g, pen, ox, oy, k, 6.4f, 7.4f, 12f, 13.2f, 17.6f, 7.4f);
+                        Poly(g, pen, ox, oy, k, 5f, 14.6f, 5f, 19.8f, 19f, 19.8f, 19f, 14.6f);
+                        break;
+                    case IconKind.Tree: // 父项 + 两个子项：比链环更像「挂到父项下」，16px 也分得清
+                        using (var node = Theme.RoundRect(new RectangleF(ox + 8.8f * k, oy + 2.6f * k, 6.4f * k, 5.2f * k), 1.4f * k))
+                        using (var c1 = Theme.RoundRect(new RectangleF(ox + 2.6f * k, oy + 15.4f * k, 6.4f * k, 5.2f * k), 1.4f * k))
+                        using (var c2 = Theme.RoundRect(new RectangleF(ox + 15f * k, oy + 15.4f * k, 6.4f * k, 5.2f * k), 1.4f * k))
+                        {
+                            g.FillPath(brush, node);
+                            g.FillPath(brush, c1);
+                            g.FillPath(brush, c2);
+                        }
+                        Line(g, pen, ox, oy, k, 12f, 7.8f, 12f, 12.4f);
+                        Line(g, pen, ox, oy, k, 5.8f, 12.4f, 18.2f, 12.4f);
+                        Line(g, pen, ox, oy, k, 5.8f, 12.4f, 5.8f, 15.4f);
+                        Line(g, pen, ox, oy, k, 18.2f, 12.4f, 18.2f, 15.4f);
                         break;
                 }
             }
             g.SmoothingMode = old;
         }
 
+        /// <summary>圆徽标里画勾用的内缩盒子：铺满整个圆会贴边，视觉上像被裁掉一块。</summary>
+        public static Rectangle BadgeGlyph(Rectangle circle)
+        {
+            int inset = Math.Max(2, circle.Width * 2 / 11);   // 22px 圆 → 4px 内缩（14px 盒子）
+            return Rectangle.Inflate(circle, -inset, -inset);
+        }
+
         private static void Poly(Graphics g, Pen pen, float ox, float oy, float k, params float[] xy)
         {
-            var pts = new PointF[xy.Length / 2];
+            g.DrawLines(pen, Points(ox, oy, k, xy));
-            for (int i = 0; i < pts.Length; i++)
+        }
-                pts[i] = new PointF(ox + xy[i * 2] * k, oy + xy[i * 2 + 1] * k);
+
-            g.DrawLines(pen, pts);
+        private static void Fill(Graphics g, Brush brush, float ox, float oy, float k, params float[] xy)
+        {
+            g.FillPolygon(brush, Points(ox, oy, k, xy));
         }
 
         private static void Line(Graphics g, Pen pen, float ox, float oy, float k, float x1, float y1, float x2, float y2)
         {
             g.DrawLine(pen, ox + x1 * k, oy + y1 * k, ox + x2 * k, oy + y2 * k);
         }
+
+        private static PointF[] Points(float ox, float oy, float k, float[] xy)
+        {
+            var pts = new PointF[xy.Length / 2];
+            for (int i = 0; i < pts.Length; i++)
+                pts[i] = new PointF(ox + xy[i * 2] * k, oy + xy[i * 2 + 1] * k);
+            return pts;
+        }
     }
 
     internal enum BadgeKind { Pending, Active, Done, Warn }
@@ -329,7 +394,8 @@ namespace TfsExcelImporter
             var r = new RectangleF(0.5f, 0.5f, Width - 1f, Height - 1f);
             using (var b = new SolidBrush(fill)) g.FillEllipse(b, r);
             g.SmoothingMode = old;
-            if (Kind == BadgeKind.Done) Icons.Draw(g, IconKind.Check, ClientRectangle, ink);
+            // 勾画在圆内缩 4px（14px 盒子 / 22px 圆），铺满整圆会贴边看着像被裁掉
+            if (Kind == BadgeKind.Done) Icons.Draw(g, IconKind.Check, Icons.BadgeGlyph(ClientRectangle), ink);
             else
                 TextRenderer.DrawText(g, Number.ToString(), Theme.CaptionBold, ClientRectangle, ink,
                     TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.NoPadding);
@@ -505,7 +571,7 @@ namespace TfsExcelImporter
                 g.SmoothingMode = SmoothingMode.AntiAlias;
                 using (var b = new SolidBrush(badgeFill)) g.FillEllipse(b, badge);
                 g.SmoothingMode = old;
-                if (Badge == BadgeKind.Done) Icons.Draw(g, IconKind.Check, badge, badgeInk);
+                if (Badge == BadgeKind.Done) Icons.Draw(g, IconKind.Check, Icons.BadgeGlyph(badge), badgeInk);
                 else
                     TextRenderer.DrawText(g, StepNumber.ToString(), Theme.CaptionBold, badge, badgeInk,
                         TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.NoPadding);
@@ -575,7 +641,7 @@ namespace TfsExcelImporter
             Width = Math.Max(Theme.Px(designMin), pad * 2 + gw + gap + Theme.TextWidth(Text, Font));
         }
 
-        private int GlyphWidth { get { return Glyph == IconKind.None ? 0 : Theme.Px(14); } }
+        private int GlyphWidth { get { return Glyph == IconKind.None ? 0 : Theme.Px(16); } }
 
         private Color FaceColor
         {
@@ -773,6 +839,10 @@ namespace TfsExcelImporter
         /// <summary>宿主右侧留给自绘箭头的区域，同时也是点击展开下拉的热区。</summary>
         private int ArrowZone { get { return Theme.Px(26); } }
 
+        /// <summary>内容左缘相对 _box 的缩进。TextBox 就摆在 Px(7)，组合框闭合态文字必须共用同一基准，
+        /// 否则同一排的输入框文字会错开一条竖线。</summary>
+        private static int TextInsetX { get { return Theme.Px(7); } }
+
         public InputField()
         {
             SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint
@@ -851,19 +921,30 @@ namespace TfsExcelImporter
                 // 闭合态就是普通输入框：白底黑字。焦点/校验态由宿主描边表达，
                 // 不响应 Selected 标记——否则一聚焦整块变浅蓝，还会把旁边的箭头衬成白色方块。
                 using (var b = new SolidBrush(Theme.Card)) e.Graphics.FillRectangle(b, full);
+                // 文字矩形不能直接用 e.Bounds：原生闭合区自带内缩（左侧约 2px、上沿同理），
+                // 且该内缩随 DPI 放大（150% 下实测 4px），照它画出来的文字会比同排 TextBox
+                // 右移、下沉 3~4px，看上去就是「没居中」。改成在 _box 坐标里定目标矩形
+                // （与 TextBox 共用 TextInsetX 基准），再换算到组合框客户区，DPI 无关。
+                // 额外再让 1px：原生那条「闭合区」裁剪边界正好压在文字起点上，贴着画会把首字
+                // 最左边的反锯齿列切掉（"ntlm" 的 n 少半竖就是这个）；顺带补上 TextBox 自身
+                // 1px 的 EM 内边距，两者文字才是同一条竖线。
+                var target = new Rectangle(TextInsetX + Theme.Px(1), 0,
+                    Math.Max(0, _box.Width - TextInsetX - Theme.Px(1) - ArrowZone), _box.Height);
+                var textRect = cb.IsHandleCreated && _box.IsHandleCreated
+                    ? cb.RectangleToClient(_box.RectangleToScreen(target))
+                    : target;
                 TextRenderer.DrawText(e.Graphics, cb.GetItemText(cb.Items[e.Index]), cb.Font,
-                    new Rectangle(full.X, full.Y, Math.Max(0, full.Width - ArrowZone), full.Height),
+                    textRect, Theme.Ink,
-                    Theme.Ink,
                     TextFormatFlags.Left | TextFormatFlags.VerticalCenter | TextFormatFlags.NoPadding
                     | TextFormatFlags.SingleLine | TextFormatFlags.EndEllipsis);
                 return;
             }
             using (var b = new SolidBrush(selected ? Theme.PrimarySoft : Theme.Card))
                 e.Graphics.FillRectangle(b, full);
-            // 列表项贴着自己窗口的左沿，要补一段缩进才和输入框里的文字对齐；
+            // 列表项贴着自己窗口的左沿（列表窗口对齐宿主外沿），要补上 _box 的 2px 内缩
-            // 闭合态的组合框本身就摆在宿主内缩处，原生 bounds 已经带了这个缩进。
+            // 和文字基准缩进，才和闭合态里的文字严格同一条竖线。
-            int pad = inBox ? 0 : Theme.Px(10);
+            int pad = TextInsetX + 2;
-            int right = inBox ? ArrowZone : Theme.Px(6);
+            int right = Theme.Px(6);
             var text = new Rectangle(full.X + pad, full.Y,
                 Math.Max(0, full.Width - pad - right), full.Height);
             TextRenderer.DrawText(e.Graphics, cb.GetItemText(cb.Items[e.Index]), cb.Font, text,
@@ -955,6 +1036,9 @@ namespace TfsExcelImporter
         private void ToggleComboDropDown()
         {
             if (!_combo.IsHandleCreated) return;
+            // 先让组合框拿到焦点：没焦点就 CB_SHOWDROPDOWN，列表展开后随即被焦点变化收掉，
+            // 表现出来就是「点一下闪一下」。
+            if (!_combo.Focused) _combo.Focus();
             bool dropped = SendMessage(_combo.Handle, CB_GETDROPPEDSTATE, IntPtr.Zero, IntPtr.Zero) != IntPtr.Zero;
             SendMessage(_combo.Handle, CB_SHOWDROPDOWN, new IntPtr(dropped ? 0 : 1), IntPtr.Zero);
         }
@@ -1040,14 +1124,19 @@ namespace TfsExcelImporter
         }
 
         private ComboListHook _listHook;
+        private IntPtr _listHwnd = IntPtr.Zero;
+        private bool _listSkinned;
 
         /// <summary>ComboLBox 随组合框句柄一起创建，尽早挂上钩子，第一次下拉就不跳。</summary>
         private void HookComboList()
         {
-            if (_listHook != null || _combo == null || !_combo.IsHandleCreated) return;
+            if (_combo == null || !_combo.IsHandleCreated) return;
             var info = new ComboInfo();
             info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(ComboInfo));
             if (!GetComboBoxInfo(_combo.Handle, ref info) || info.hwndList == IntPtr.Zero) return;
+            if (_listHook != null && _listHook.Handle == info.hwndList) return;   // 已挂在当前列表窗口上
+            // 列表窗口被重建过：旧钩子会留在已销毁的句柄上，必须换新的
+            if (_listHook != null) { _listHook.ReleaseHandle(); _listHook = null; }
             _listHook = new ComboListHook(this);
             _listHook.AssignHandle(info.hwndList);
         }
@@ -1076,17 +1165,37 @@ namespace TfsExcelImporter
             var info = new ComboInfo();
             info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(typeof(ComboInfo));
             if (!GetComboBoxInfo(_combo.Handle, ref info) || info.hwndList == IntPtr.Zero) return;
-            int style = GetWindowLong(info.hwndList, GWL_STYLE);
+            // 列表窗口重建后边框会长回来，按句柄判断是否需要重新剥一次
-            if ((style & WS_BORDER) != 0)
+            if (_listHwnd != info.hwndList) { _listHwnd = info.hwndList; _listSkinned = false; }
-                SetWindowLong(info.hwndList, GWL_STYLE, style & ~WS_BORDER);
+
-            int ex = GetWindowLong(info.hwndList, GWL_EXSTYLE);
+            bool skin = false;
-            if ((ex & WS_EX_CLIENTEDGE) != 0)
+            if (!_listSkinned)
-                SetWindowLong(info.hwndList, GWL_EXSTYLE, ex & ~WS_EX_CLIENTEDGE);
+            {
+                int style = GetWindowLong(info.hwndList, GWL_STYLE);
+                if ((style & WS_BORDER) != 0)
+                {
+                    SetWindowLong(info.hwndList, GWL_STYLE, style & ~WS_BORDER);
+                    skin = true;
+                }
+                int ex = GetWindowLong(info.hwndList, GWL_EXSTYLE);
+                if ((ex & WS_EX_CLIENTEDGE) != 0)
+                {
+                    SetWindowLong(info.hwndList, GWL_EXSTYLE, ex & ~WS_EX_CLIENTEDGE);
+                    skin = true;
+                }
+                _listSkinned = true;
+            }
             RECT r;
             if (!GetWindowRect(info.hwndList, out r)) return;
             var host = RectangleToScreen(ClientRectangle);
+            // 位置已经被 ComboListHook 改写到宿主外沿时不要再 SetWindowPos：
+            // 每重摆一次列表窗口都要整窗重算重画，肉眼就是「打开瞬间闪一下」。
+            bool moved = r.Left != host.Left || r.Top != host.Bottom || (r.Right - r.Left) != host.Width;
+            if (!moved && !skin) return;
+            // 只有真的改了窗口样式才需要 SWP_FRAMECHANGED（它强制整窗重算非客户区）
             SetWindowPos(info.hwndList, IntPtr.Zero, host.Left, host.Bottom,
-                host.Width, r.Bottom - r.Top, SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
+                host.Width, Math.Max(0, r.Bottom - r.Top),
+                SWP_NOZORDER | SWP_NOACTIVATE | (skin ? SWP_FRAMECHANGED : 0));
         }
 
         protected override void OnPaint(PaintEventArgs e)

debug.log

@@ -1,2 +1,4 @@
 [1101/171941.143:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 系统找不到指定的文件。 (0x2)
 [1101/173900.093:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 系统找不到指定的文件。 (0x2)
+[1101/184906.941:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 系统找不到指定的文件。 (0x2)
+[1101/191310.883:ERROR:third_party\crashpad\crashpad\util\win\registration_protocol_win.cc:108] CreateFile: 系统找不到指定的文件。 (0x2)